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SOVA2 [1]
3 years ago
5

How do you solve this? Number 3 please

Mathematics
1 answer:
max2010maxim [7]3 years ago
3 0
First, you have to find out what's 7% of $80. So what you do is multiply 80 by 0.07, which leaves you with $5.60. Add 5.6 to 80 so you get 85.6. Now you have to find how much the 20% of 80 is. So you multiply 80 by 0.2, leaving you with 16. So you subtract 16 from 85.6, leaving you with 69.6. So the total cost of the skateboard would be $69.60.
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1. is he equation true , false, or open
RideAnS [48]

Question 1:

For this case we have the following equation:

 5x ^ 2 = 6x + 11

We observe that the equation is a polynomial of the second degree.

Therefore, the equation has two possible solutions.

The variable of the equation for this case is x.

In this case, we have an open equation because we have a variable.

Rewriting the equation we have:

5x ^ 2 - 6x - 11 = 0

Answer:

open, there is a variable.


Question 2:

For this case we have the following equation:

 2-8x = -6

From here, we must clear the value of x.

For this, we follow the following steps:

1) Pass the value of 8x adding:

2 = -6 + 8x

2) Pass the value of 6 adding:

2 + 6 = 8x

3) Add the values ​​on the same side of equality:

 8x = 8

4) Pass the 8 to divide:

x = \frac{8}{8} = 1

Answer:

The value of x is given by:

x = 1


Question 3:

For this case we have the following equation:

 y = x-4

The ordered pair solution is the one that satisfies both sides of the equation.

For the point (6, 2) we have:

x = 6  y = 2

Substituting values ​​we have:

2 = 6-4  2 = 2

We observe that both sides of the equation are equal.

Therefore, the ordered pair solution is (6, 2)

Answer:

An ordered pair that is a solution of the equation y = x-4 is:

(6, 2)

3 0
3 years ago
Read 2 more answers
The price of Stock A at 9 A.M. was​ $15.75. Since​ then, the price has been increasing at the rate of​ $0.05 per hour. At​ noon,
tatyana61 [14]

Answer: I think is 3.5

Step-by-step explanation:

7 0
3 years ago
What is the LCM and GCF of<br> 37 and 12
RSB [31]
I hope this helps you

7 0
3 years ago
21
Tju [1.3M]

Answer:

64x^127

Step-by-step explanation:

caculate it with all the numb

3 0
2 years ago
PLEASE HELP<br><br> Which of the following is the inverse of f(x)=3-x/5
BabaBlast [244]

Answer:

f^-1(x) = 3 - 5x, second option

Step-by-step explanation:

To determine the inverse simply interchange the variables and solve for y;

f(x) = 3 - x / 5 -> Interchange the variables

x = 3 - y/5 -> Multiply either side by 5

5x = 3 - y -> Subtract three from either side

- y = 5x - 3 -> Divide either side by - 1

y = - 5x + 3

Your solution is f^-1(x) = 3 - 5x

8 0
3 years ago
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